Eglinton Crosstown LRT - Design

Owner
Metrolinx and Infrastructure Ontario
Client
CTS An SNC, Dragados, Aecon, EllisDon JV
Cost
$8.25 billion CAD
Timeframe
June 2015 — ongoing
Services performed
Preliminary and final SEM tunnel design. Primary and secondary lining, waterproofing and interior structures on three SEM stations (namely Laird, Avenue and Oakwood).
Description
The Crosstown is a light rail transit line, which is part of the regional transportation plan for the Greater Toronto and Hamilton Area. The project will provide a 19km corridor across Eglinton Avenue, connecting ten stops at grade and 15 underground stations with a 10km twin-bored tunnel. Dr G. Sauer & Partners provided detailed design for Oakwood, Avenue, and Laird stations. A combination of Cut-and-Cover construction for the shafts and mined techniques (SEM) for the tunnels was utilised. Finite element analyses were carried out to determine structural capacity of linings and trigger values to meet stingent settlement criteria at the surface.
Geology
Glacial depositional systems created a complex distribution of heavily overconsolidated till layers, separated by interstadial stratified deposits of glaciolacustrine clay, silt, and sand.
Location
Toronto, Canada

Highlights

  • Difficult geological and hydrological ground conditions using pipe arch pre-support
  • Shallow tunnelling underneath roads and buildings
  • Large tunnel geometry in soft ground utilising double-side wall drifts
Route Map (www.thecrosstown.ca)

Route Map (www.thecrosstown.ca)

3D Finite Element Analysis Laird Station Cross Cut